Thanks - that makes sense - I probably had all of the above - may have had locktite and I only shoved in a little bit of string- probably torqued on the piston if it was to one side or something - I wasn't expecting the nut to be so tight. I have worked on many engines before but not this new or small of one and usually lawnmowers or old chainsaws. This piston really is quite fragile in design but that makes it light - cheap too I suppose. Probably wasn't smart but I decided to order a piston - rest of engine is so clean, light and it really is a compact design and looks like an easy conversion - I hope. What happend to me is apparently a rare occurance - perfect storm of mistakes.

Does anybody make a prop adapter for these engines?